Delete internal projects/rocket directory from monorepo

[caendesilva]

This is not being actively developed, and is mirrored to https://github.com/hydephp/rocket and can thus be removed from the monorepo.

[codecov]

Codecov Report

Merging #235 (0bccd07) into master (0a2aba7) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #235   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       816       816           
===========================================
  Files            103       103           
  Lines           2092      2092           
===========================================
  Hits            2092      2092           

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